Transfer ink for marking leather



' i porous than textiles, and which will give a Patented July 14, 1925.

1,545,836 UNITED STATE PATENT OFFICE.

wIN'rHEor STANLEY LAWRENCE, or BaooKLYN, NEW YORK, AND FREDERICK-W.

BARKER, an... or MOERRISTOWN, NEW JERSEY, Assm ons 'ro numaemrn 00., or NEW YORK, N. Y., A CORPORATION or NEW YORK.

TmiNsrEn INK iron and 41 Franklin Street, cit of Morristown, countyof Morris, State of ew Jersey, have invented certain new and useful Improvements in Transfer In]: for Marking Leather,

of which the following is a specification.

This invention relates to a new and improved transfer ink.

One of the objects of this invention is to provide a new and improved transfer ink for marking leather, rubber and some textiles.

' Another object ofthis invention is to provide a new and improved transfer ink which will not smear on the leather, which is less firm and non-smeary permanent impression on the leather in spite of the presence of the stufling greases in said leather. a

It has been discovered that a mixture. 0 Venice turpentine and shellac produces a composition which is not attacked by the stufling greases in leather. Shellac and butyl tartrate givea composition, whose range of melting is so great that good results can be secured on hard, impervious leather surfaces, such as horse hide and roller lamb and the like. The composition of the abovementioned substances produces a product which is very resistant to the greases and can be applied very efficiently. Since the cost of Venice turpentine is rather high, a substitute therefor can be made by combining rosin and butyl tartrate. A'suitable formula can be made up as follows:

Orange shellac in the flake form-12 parts by weight.

Pine rosin W. W. 12 parts.

Butyl tartrate2% parts.

The shellac is present in suflicient quantity to give the ink the desired qualities. For best results the shellac should comprise more than 33% percent by weight of the ink.

This formula can be slightly modified-to meet weather requirements by making it softer or harder.

The rosin should be free from dirt and MARKIN LEATHER.

1923. Serial No. 630,641.

tartrate but most of them are much more expensive and in addition,.most of them are more volatile than butyl tartrate which is a disadvantage.

It is, not believed that any chemical reactions take place in mixing the above-in-v gredients, which is done under suitable temperature conditions to secure a thorough mixture, but on exposure to the air some oxliidation takes place on the surfacejof the in The shellac is used for its working qualities and because it produces-an ink which can be advantageously applied. Its principal utility is due to the fact that it is insoluble in oils and the like which are used inthe greases employed for stufiing leather. The rosin employed in the above formula is used as a diluent to lower thev price and Inks made according to this formula are used for marking both natural and artificial leather and also for marking rubber.

Another suitable formula could be'made by combining one part by weight of shellac and apart of true-Venice turpentine. This true Venice turpentine is an exudation from a foreign larch and has about the consistency of thick molasses. The shellac is used. for the reasons before mentioned and the Venice turpentineis used as a softening agent.

The second mentioned formula is not as desirable as the first as it is not as useful for marking hard leathers.

The compositions before mentioned are made by first heating theproper amount of rosin until it begins to bubble and then stirring in the shellac asvrapidly as possible while keeping the substance fluid at all times.

After the shellac is added and the mixture is homogeneous, the butyl tartrate is stirred in and then the bronze or pigment is also stirred in. When this is completed.

the composition is panned and kept in the is to solid state until ready for use. The composition can be kept hot for a couple of hours, if necessary.

In making the ink from Venice turpentine and shellac alone, the shellac is first melted and the Venice turpentine is added.

We have described referred embodiments of our invention but t is clear that changes and omissions could be made without defparting from its spirit and whenever we re er to any substance or substances in the claims it be understood that such reference includes all substances equivalent thereto.

We claim:

1. A solid, fusible, non-smeary, adherent ink for marking leather and the like, said ink containing coloring matter, and also containing solid shellac in'suflicient proportion to render theink resistant to greases said ink being free from any shellac solvent.

2. A solid, fusible, non-smeary, adherent ink for marking leather and the like, said ink containing coloring matter, solid shellac in sufficient proportion to render said ink resistant to grease s, and also containing a solid substance having a melting point lower than shellac and misciblewith molten shellac said ink being free from any shellac solvent.

3. A solid, fusible, adherent, non-smeary ink for marking leather and the like, containing coloring matter, shellac, rosin, and an ester whose volatility is equal to or less than that of butyl tartrate, said ink containing a suflicient proportion of shellac to render it resistant to greases, the said rosin and ester bein present in sufficient pro rtion to make t e fnsed ink sufiiciently iiiiid to be taken up by the object tobe marked.

4. A solid, fusible, adherent, non-smeary ink for marking leather and the like, containing coloring matter, shellac, rosin and butyl tartrate, said ink containing a sufiicient proportion of shellac to render it resistant to greases, and containing a suflicient proportion of rosin and butyl tartrate to renderthe fused ink sufliciently fluid to be taken up 7. A solid, fusible, non-smear adherent ink consisting substantially of co oring matter, twelve parts by weight of shellac, twelve parts by weight of pine rosin, and two and a half parts by weight of butyl tartrate.

8. A method of making a solid, fusible, non-smeary, adherent ink for marking leather and the like, which consists in melting and heating rosin until it begins to bubble, then adding shellac while keeping the melt fluid and stirring the ingredients to roduce a homogeneous mixture then addlng an ester whose melting point is less than butyl tartrate, and stirring until the mixture is homogeneous and then adding the pigment.

In testimony whereof we hereunto aflix our signatures. WINTHROP STANLEY LAWRENCE. FREDERICK W. BARKER, JR. 

